usys = uss(sys) converts
an arbitrary ss, tf or zpk model sys to
an uncertain state-space object without uncertainties. Both usys.NominalValue and simplify(usys,'class') are
the same as ss(sys).

Examples

You can first create two uncertain atoms and use them to create
two uncertain matrices. These four matrices can be packed together
to form a 1-output, 1-input, 2-state continuous-time uncertain state-space
system.

In the second example, you can convert a not-uncertain tf model
to an uncertain state-space model without uncertainties. You can verify
the equality of the nominal value of the usys object
and simplified representation to the original system.